P
US7101830B2ExpiredUtilityPatentIndex 81

Gas engine lubricating oil composition

Assignee: INFINEUM INT LTDPriority: Mar 12, 2002Filed: Mar 3, 2003Granted: Sep 5, 2006
Est. expiryMar 12, 2022(expired)· nominal 20-yr term from priority
Inventors:OWEN YOLANDACHAMBARD LAURENT
C10M 2207/26C10M 2223/045C10M 2215/223C10N 2030/45C10N 2010/04C10N 2030/02C10M 2219/089C10M 2203/10C10N 2030/52C10N 2030/08C10M 2219/046C10M 2207/144C10N 2060/14C10M 2207/262C10M 2207/027C10M 2219/088C10N 2030/04C10M 2219/044C10M 2207/028C10N 2010/02C10N 2020/02C10N 2040/25C10N 2040/40C10N 2030/43C10M 2229/041C10M 169/04C10N 2030/10C10M 2215/28C10M 2215/064C10N 2040/12C10M 2203/1006C10M 2207/16
81
PatentIndex Score
14
Cited by
18
References
9
Claims

Abstract

A gas engine lubricating oil composition having a boron content of more than 95 ppm, the gas engine lubricating oil composition comprising: a major amount of a lubricating oil having a viscosity index of 80 to 120, and including at least 90 mass percent of saturates and 0.03 mass percent or less of sulphur; and at least one metal detergent. The gas engine lubricating oil composition exhibits improved oxidation and reduced deposit formation.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A gas engine lubricating oil composition having a boron content of more than 95 ppm, the gas engine lubricating oil composition comprising:
 a) a major amount of a lubricating oil having a viscosity index of 80 to 120, and including at least 90 mass percent of saturates and 0.03 mass percent or less of sulphur; and 
 b) detergent, consisting essentially of calcium salicylate detergent having a TBN in the range of 40 to less than 150. 
 
     
     
       2. The composition as claimed in  claim 1 , wherein the boron content is from 95 to 400 ppm. 
     
     
       3. The composition claimed in  claim 1 , wherein the boron is provided by a borated metal detergent, a borated dispersant, or a combination thereof. 
     
     
       4. A method of lubricating a gas engine, the method comprising the step of operating the gas engine while lubricating it with the gas engine lubricating oil composition claimed in  claim 1 . 
     
     
       5. A method of improving resistance to oxidation and reducing deposit formation in a gas engine, which method comprises lubricating said gas engine with a lubricating oil composition as claimed in  claim 1 . 
     
     
       6. The composition as claimed in  claim 1 , wherein the metal detergent has a TBN in the range of 50 to 140. 
     
     
       7. The composition as claimed in  claim 6 , wherein the metal detergent has a TBN in the range of 60 to 130. 
     
     
       8. The composition as claimed in  claim 1 , which has a TBN in the range of 5 to 15. 
     
     
       9. The composition as claimed in  claim 8 , which has a TBN in the range of greater than 5.9 to less than 11.1.

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References (0)

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